RTS Camera - Epic Wiki
# RTS Camera
# Contents
# RTS Camera Code
# Details
I will add more details to this page when I have time, just thought I would share my code for an RTS Camera for those of you who need a place to start! Let me know if you have any questions or suggestions to improve my code! The cursor is not locked into the viewport, I am still looking for a way to do this.
Also, for zooming with the mouse wheel, add the inputs for mouse wheel up and down with the names:
WheelMouseUp
WheelMouseDown
Hope this helps!
Connor Brewster
# FESpectatorPawn.h
#pragma once #include "GameFramework/SpectatorPawn.h" #include "FESpectatorPawn.generated.h" /** AFESpectatorPawn * This Pawn Will Move Like An RTS Camera */ UCLASS() class FE_API AFESpectatorPawn : public ASpectatorPawn { GENERATED_UCLASS_BODY() public: /** Camera Component */ UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = Camera) TSubobjectPtr<class UCameraComponent> CameraComponent; /** Camera Z Angle */ UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = Camera) float CameraZAnlge; /** Camera Radius From Pawn Position */ UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = Camera) float CameraRadius; /** Camera Height Angle */ UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = Camera) float CameraHeightAngle; /** Camera Zoom Speed */ UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = Camera) float CameraZoomSpeed; /** Camera Radius Max */ UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = Camera) float CameraRadiusMax; /** Camera Radius Min */ UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = Camera) float CameraRadiusMin; /** Camera Movement Speed */ UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = Camera) float CameraMovementSpeed; /** Camera Scroll Boundary */ UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = Camera) float CameraScrollBoundary; /** Should the camera move? */ UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = Camera) bool bCanMoveCamera; private: /** Sets up player inputs * @param InputComponent - Input Component */ void SetupPlayerInputComponent(class UInputComponent* InputComponent); public: /** Zooms In The Camera */ UFUNCTION() void ZoomIn(); /** Zooms Out The Camera */ UFUNCTION() void ZoomOut(); /** Gets the roatation of the camera with only the yaw value * @return - returns a rotator that is (0, yaw, 0) of the Camera */ UFUNCTION() FRotator GetIsolatedCameraYaw(); /** Moves the camera forward * @param direcation - (1.0 for forward, -1.0 for backward) */ UFUNCTION() void MoveCameraForward(float direction); /** Moves the camera forward * @param direcation - (1.0 for right, -1.0 for left) */ UFUNCTION() void MoveCameraRight(float direction); /** Repositions The Camera */ UFUNCTION() void RepositionCamera(); /** Tick Function, Called Every Frame */ UFUNCTION() virtual void Tick(float deltaSeconds) override; };
# FESpectatorPawn.cpp
#include "FE.h" #include "FESpectatorPawn.h" AFESpectatorPawn::AFESpectatorPawn(const class FPostConstructInitializeProperties& PCIP) : Super(PCIP) { //Disable Standard WASD Movement bAddDefaultMovementBindings = false; //Set Default Camera Values CameraRadius = 1000.0f; CameraZAnlge = 0.0f; CameraHeightAngle = 70.0f; CameraZoomSpeed = 32.0f; CameraRadiusMin = 750.0f; CameraRadiusMax = 2000.0f; CameraMovementSpeed = 2000.0f; CameraScrollBoundary = 25.0f; //TODO: While selecting units, the camera CANNOT move! bCanMoveCamera = true; //Intialize The Camera CameraComponent = PCIP.CreateDefaultSubobject<UCameraComponent>(this, TEXT("RTS Camera")); CameraComponent->AttachParent = this->GetRootComponent(); CameraComponent->bUsePawnControlRotation = false; RepositionCamera(); //Enable Tick function PrimaryActorTick.bCanEverTick = true; } void AFESpectatorPawn::SetupPlayerInputComponent(class UInputComponent* InputComponent) { check(InputComponent); //Bind Mouse Wheel Zooming Actions InputComponent->BindAction("WheelMouseUp", IE_Pressed, this, &AFESpectatorPawn::ZoomIn); InputComponent->BindAction("WheelMouseDown", IE_Pressed, this, &AFESpectatorPawn::ZoomOut); //Bind WASD Movement //FOR TESTING PURPOSES ONLY!!! //InputComponent->BindAxis("MoveForward", this, &AFESpectatorPawn::MoveCameraForward); //InputComponent->BindAxis("MoveRight", this, &AFESpectatorPawn::MoveCameraRight); } void AFESpectatorPawn::ZoomIn() { //Don't execute any further if the camera can't move if (!bCanMoveCamera) return; //Decrease the CameraRadius but clamp it between the min and max radii CameraRadius = FMath::Clamp(CameraRadius - CameraZoomSpeed, CameraRadiusMin, CameraRadiusMax); //Reposition the camera in the local space RepositionCamera(); } void AFESpectatorPawn::ZoomOut() { //Don't execute any further if the camera can't move if (!bCanMoveCamera) return; //Increase the CameraRadius but clamp it between the min and max radii CameraRadius = FMath::Clamp(CameraRadius + CameraZoomSpeed, CameraRadiusMin, CameraRadiusMax); //Reposition the camera in the local space RepositionCamera(); } FRotator AFESpectatorPawn::GetIsolatedCameraYaw() { //Return a FRotator containing (0, CameraYaw, 0) return FRotator(0.0f, CameraComponent->ComponentToWorld.Rotator().Yaw, 0.0f); } void AFESpectatorPawn::MoveCameraForward(float direction) { //Don't execute any further if the camera can't move if (!bCanMoveCamera) return; //Calculate how much to move the camera by float movementValue = direction * CameraMovementSpeed; //Create a delta vector that moves by the movementValue in the direction of the camera's yaw FVector deltaMovement = movementValue * GetIsolatedCameraYaw().Vector(); //Add the delta to a new vector FVector newLocation = this->GetActorLocation() + deltaMovement; //Set the new location of the pawn SetActorLocation(newLocation); } void AFESpectatorPawn::MoveCameraRight(float direction) { //Don't execute any further if the camera can't move if (!bCanMoveCamera) return; //Calculate how much to move the camera by float movementValue = direction * CameraMovementSpeed; //Create a delta vector that moves by the movementValue in the direction of the right of the camera's yaw FVector deltaMovement = movementValue * (FRotator(0.0f,90.0f,0.0f) + GetIsolatedCameraYaw()).Vector(); //Add the delta to a new vector FVector newLocation = this->GetActorLocation() + deltaMovement; //Set the new location of the pawn SetActorLocation(newLocation); } void AFESpectatorPawn::RepositionCamera() { //Create variables to hold the new values FVector newLocation(0.0f, 0.0f, 0.0f); FRotator newRotation(0.0f, 0.0f, 0.0f); //Find Cos and Sin of the Camera Z Angle float sinCameraZAngle = FMath::Sin(FMath::DegreesToRadians(CameraZAnlge)); float cosCameraZAngle = FMath::Cos(FMath::DegreesToRadians(CameraZAnlge)); //Find the Cos and Sin of the Camera Height Angle float sinCameraHeightAngle = FMath::Sin(FMath::DegreesToRadians(CameraHeightAngle)); float cosCameraHeightAngle = FMath::Cos(FMath::DegreesToRadians(CameraHeightAngle)); //Set newLocation X to cosCameraZAngle * sinCameraHeightAngle * CameraRadius newLocation.X = cosCameraZAngle * cosCameraHeightAngle * CameraRadius; //Set newLocation Y to sinCameraZangle * sinCameraHeightAngle * CameraRadius newLocation.Y = sinCameraZAngle * cosCameraHeightAngle * CameraRadius; //Set newLocation Z to cosCameraHeightAngle * CameraRadius newLocation.Z = sinCameraHeightAngle * CameraRadius; //Set the new rotations newRotation = (FVector(0.0f,0.0f,0.0f) - newLocation).Rotation(); //Set the camera's location and rotation to the new values CameraComponent->SetRelativeLocation(newLocation); CameraComponent->SetRelativeRotation(newRotation); } void AFESpectatorPawn::Tick(float deltaSeconds) { Super::Tick(deltaSeconds); //Create variables to hold mouse position and screen size FVector2D mousePosition; FVector2D viewportSize; //Get mouse position and screen size UGameViewportClient* gameViewport = GEngine->GameViewport; //Make sure viewport exists check(gameViewport); gameViewport->GetViewportSize(viewportSize); //Make sure the viewport has focus(contains the mouse) if (gameViewport->IsFocused(gameViewport->Viewport) && gameViewport->GetMousePosition(mousePosition) && bCanMoveCamera) { //Check if the mouse is at the left or right edge of the screen and move accordingly if (mousePosition.X < CameraScrollBoundary) { MoveCameraRight(-1.0f * deltaSeconds); } else if (viewportSize.X - mousePosition.X < CameraScrollBoundary) { MoveCameraRight(1.0f * deltaSeconds); } //Check if the mouse is at the top or bottom edge of the screen and move accordingly if (mousePosition.Y < CameraScrollBoundary) { MoveCameraForward(1.0f * deltaSeconds); } else if (viewportSize.Y - mousePosition.Y < CameraScrollBoundary) { MoveCameraForward(-1.0f * deltaSeconds); } } }
Retrieved from "https://wiki.unrealengine.com/index.php?title=RTS_Camera&oldid=9763"
